Long-Term Debt (Details) (USD $)						1 Months Ended	6 Months Ended					1 Months Ended	6 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011	Jun. 30, 2012 Minimum	Jun. 30, 2012 Maximum	Jul. 31, 2011 Wells Fargo revolving loans	Jun. 30, 2012 Wells Fargo revolving loans acre	Dec. 31, 2011 Wells Fargo revolving loans	Aug. 31, 2011 Wells Fargo revolving loans	Jun. 30, 2012 Wells Fargo revolving loans Minimum	Jun. 30, 2012 Wells Fargo revolving loans Maximum	Jan. 31, 2012 American AgCredit term loan, 5.25%	Jun. 30, 2012 American AgCredit term loan, 5.25% acre	Dec. 31, 2011 American AgCredit term loan, 5.25%	Jun. 30, 2012 American AgCredit term loan, 5.25% Minimum	Jun. 30, 2012 American AgCredit term loan, 5.25% Maximum
Long-Term Debt
Long-term debt	$ 46,868,000	$ 45,521,000	$ 45,521,000				$ 22,800,000	$ 21,100,000					$ 24,068,000	$ 24,421,000
Less current portion	46,868,000
Long-term debt		45,521,000	45,521,000
Interest rate (as a percent)							4.05%	4.12%
Interest rate (as a percent)													5.25%	5.25%
Maximum borrowing capacity							34,500,000
Variable rate basis							LIBOR						30-day LIBOR
Interest rate margin (as a percent)							3.80%						4.25%
Area of the company's real estate pledged as collateral (in acres)							880						3,100
Required liquidity under financial covenants				4,000,000						4,000,000					4,000,000
Required total liabilities under financial covenants					175,000,000						175,000,000					175,000,000
Aggregate amount of credit line as a percentage of value of property to extend maturity date							40.00%
Operating income attributable to properties as a percentage of aggregate amount to extend maturity date							6.00%
Repayment of line of credit						4,100,000
Repayment of principal												353,000
Credit availability reserved for payment of legacy costs									4,100,000
Amount of credit line availability excluded from calculation of liquidity financial covenant							4,100,000
Legacy costs paid							4,100,000
Available borrowing capacity							11,200,000
Irrevocable letters of credit							$ 500,000
Interest rate, variable interest rate floor (as a percent)													1.00%
Applicable spread after tiered reduction (as a percent)													0.0375
Mandatory principal prepayment as percentage of the net proceeds of the sale of any real property pledged as collateral													100.00%
Mandatory principal prepayment as percentage of the net proceeds of the sale of non-collateralized real property															10.00%	75.00%